CVE-2024-26883
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stackmap overflow check on 32-bit arches The stackmap code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. The commit in the fixes tag actually attempted to fix this, but the fix did not account for the UB, so the fix only works on CPUs where an overflow does result in a neat truncation to zero, which is not guaranteed. Checking the value before rounding does not have this problem.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2024-26883
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2024-26883.html
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.85-1 |
| debian | bullseye | fixed | 5.10.216-1 |
| debian | forky | fixed | 6.7.12-1 |
| debian | sid | fixed | 6.7.12-1 |
| debian | trixie | fixed | 6.7.12-1 |
| debian | 10.0 | affected | |
| linux-kernel | affected | 4.10 |
References
- https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a
- https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895
- https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d
- https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0
- https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a
- https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b
- https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae
- https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3
- https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://www.suse.com/security/cve/CVE-2024-26883.html
- https://security-tracker.debian.org/tracker/CVE-2024-26883
CWEs
CWE-119
Verify integrity in audit chain (admin only). AS-IS.